午夜伧理A级日韩1片

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測試開發之网络篇-网络路由

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aaronchen2k

2021-05-25 14:17:42

2260

摘要：本文展示了一个简化的办公网络，幫助你简单了解交换网络和路由网络不同的工作方式。

互聯網是一個龐大的分層網狀結構，億萬的設備分布在其大大小小的子網中。這裏我們展示了一個簡化的辦公網絡，包括3個子網，子網間通過路由器相連，子網內部使用二層交換機或無線熱點連接了一些電腦和辦公設備。

图中的二层交换机是工作在数据链路层的，它维护了一个通过ARP（Address Resolution Protocol，地址解析协议）学习到的、IP地址到物理地址的映射，以此来决定发往某个目标主机的数据包，从交换机哪个端口转发出去。从而实现同網段內設備的通信。

路由器是工作在网络层的，它的端口连接了另一个路由器或交换机，每个端口配置了（到达）不同子网的地址。路由器间使用OSPF（Open Shortest Path First，开放式最短路径优先）协议，相互学习形成一个路由表，用于掌握类似“可以通过哪一个路由器的、哪个端口、到达指定的子网、距离有多远”等信息。

網絡裏的每個主機（網卡），手工配置或從DHCP獲得了一個IP地址，包括主機地址、子網掩碼和默認網關。当子网3中的主机192.168.0.100/24希望向子网1中的Web服務器172.16.1.10/24发送请求时，数据包首先会被发往默認網關-這裏是無線路由器連接子網3的那個端口的地址192.168.0.1；無線路由器檢查路由表，獲取通往子網1的最優路徑，通過指定的端口，將數據包轉發給下一站路由器；如此繼續完成跨網段間的通訊。

本篇文章，目的是簡單了解交換網絡和路由網絡不同的工作方式，以鞏固前面所學的知識。有興趣的朋友，可以閱讀思科CCNA認證相關的資料，獲取更多信息。

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For the next few days the proposed journey was the theme of conversation in the Bassett family. Mary examined all the books she could find about the countries her brother expected to visit; then she made a list of the things she desired, and the day before his departure she gave him a sealed envelope containing the paper. She explained that he was not to open it until he reached Japan, and that he would find two lists of what she wanted. From the railway station our travellers went to the Nihon Bashi, in order to begin their journey from the centre of the empire. A more[Pg 116] practical reason was a desire to see the river, and the great street leading to it, as they would get a good idea of the extent of the city by taking this route, and would obtain numerous glimpses of Japanese street life. They found the streets full of people, and it seemed to the boys that the whole population must be out for an airing. But the Doctor informed them that the sight they were witnessing was an every-day affair, as the Japanese were essentially an outdoor people, and that many of the industries which in other countries would be conducted under a roof were here seen in progress out of doors. The fronts of the Japanese houses are quite open to the view of the public, and there is hardly anything of what we call privacy. It was formerly no uncommon sight to see people bathing in tubs placed in front of their door-steps; and even at the present time one has only to go into the villages, or away from the usual haunts of foreigners, to see that spectacle which would be unknown in the United States. The bath-houses are now closed in front in all the cities, but remain pretty much as before in the smaller towns. Year by year the country is adopting Western ideas, and coming to understand the Western views of propriety. The one at the end accomplishing a graceful pirouette is me--I mean Even M. Vacherot, with all his anxiety to discover an Oriental origin for Neo-Platonism, cannot help seeing that this attack on the Gnostics was inspired by an indignant reaction of Greek philosophy against the inroads of Oriental superstition, and that the same character belongs more or less to the whole system of its author. But, so far as we are aware, Kirchner is the only critic who has fully worked out this idea, and exhibited the philosophy of Plotinus in its true character as a part of the great classical revival, which after producing the literature of the second century reached its consummation in a return to the idealism of Plato and Aristotle.522 "At eight o'clock, sir," he answered resentfully, "in front of the dry-goods store on the main street. If that is convenient for your men." "Come on over," the master said from the doorway. "Come on over." He made a beckoning motion. She could not discipline her attitude towards him—sometimes she was composed, distant even in her thoughts; at others a kind of delirious excitement possessed her, she flushed and held down her head in his presence, could not speak to him, and groped blindly for escape. She would, on these occasions, end by returning to Rye, but away from Reuben a restless misery tormented her, driving her back to Odiam. "My lord, I was unwilling that a soul should be lost——" This unexpected consummation wrought upon Holgrave so much, that, with the sullen determination which had marked his character on previous occasions, he resolved not to answer any questions whatever. We should have premised, that the galleyman had given Holgrave a solemn promise, that if any ill befel him, Margaret should be cared for like his own wife. This was a solace to him, as he thought over his mother's death, and his own evil destiny. But there was another solace, that, strange as it may appear to some minds, arose from the thought, that whatever might befall him, the baron's heir would share in it. At first, when he had been removed to Sudley, mild measures were resorted to. He was lodged in a comfortable apartment, fed plentifully, and promised his freedom with whatever reward he might claim, if he would but speak satisfactorily as to the lost child. When this failed, he was sent to the keep, and for a week black bread and cold water were the only articles of aliment supplied; and then the peine forte et dure was resorted to. But though his face was swollen, and of a livid, purple hue, and the eyes seemed starting from their sockets at the pressure on his chest, as he lay with his limbs extended on the earth, yet would he not speak the word which would have released him from all this suffering. The extreme punishment, however, of adding weights until nature could sustain no more, was delayed from day to day. The baroness had twice given birth to children who had survived but a few hours; the third had lived, but it was a daughter; and as she dwelt upon the approaching extinction of their noble line, she dared not permit the order to be given that might deprive her of all hope. Day after day were the weights pressing and stifling, and forcing the blood that still crept through his veins to his extremities, and distending the hands and feet with a feeling of agony. But though the pressure was at each time removed when the leech pronounced the prisoner exhausted, yet it appeared repetition, though slow, would effect the work as surely as if the punishment had been in the first instance applied in all its legal rigour. HoME 午夜伧理A级日韩1片ENTER NUMBET 002www.mjiaf.com
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